Tuesday, August20, 2019 L-36.com


Marine Weather and Tides
Huntington, VA

Version 3.4
NOTICE
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.
6/2/2019. Many thanks to a user for reporting an error on one of the Edit pages. The switch to PHP 7.2 caused many pages that previously worked to quit working. I fixed many but I still depend on users to report ones I missed. Please report errors HERE or send an email to me at L-36.com. Allen

Sunrise 6:25AMSunset 7:58PM Tuesday August 20, 2019 11:51 AM EDT (15:51 UTC) Moonrise 9:47PMMoonset 10:00AM Illumination 75% Phase: Waning Gibbous; Moon at 20 days in cycle
NOTE: Some of the data on this page has not been verified and should be used with that in mind. It may and occasionally will, be wrong. The tide reports are by xtide and are NOT FOR NAVIGATION.
Marine Forecasts
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ANZ535 Tidal Potomac From Key Bridge To Indian Head- 1035 Am Edt Tue Aug 20 2019
Rest of today..SE winds 5 kt. Waves less than 1 ft. Scattered showers and tstms this afternoon.
Tonight..S winds 5 kt. Waves less than 1 ft. A chance of showers and tstms. Patchy fog.
Wed..SW winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms.
Wed night..SW winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms.
Thu..SW winds 5 kt. Waves less than 1 ft. A chance of showers and tstms.
Thu night..NW winds around 5 kt. Waves 1 ft. A chance of showers.
Fri..N winds 5 kt. Waves less than 1 ft. A chance of showers and tstms.
Sat..NE winds around 5 kt. Waves 1 ft. A chance of showers and tstms in the morning. Winds and waves higher and visibilities lower in and near tstms.
ANZ500 1035 Am Edt Tue Aug 20 2019
Synopsis for the tidal potomac and md portion of the chesapeake bay.. High pressure in the atlantic will promote a light southerly flow over the region into Wednesday. A cold front will approach the waters late Wednesday night into Thursday. High pressure will then settle over the area Friday and dominate into the weekend. Small craft advisories may be required for portions of the waters Wednesday afternoon and Wednesday night.


7 Day Forecast for Marine Location Near Huntington, VA
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location: 38.79, -77.07     debug


Area Discussion for - Baltimore, MD/Washington
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Fxus61 klwx 201343 aaa
afdlwx
area forecast discussion... Updated
national weather service baltimore md washington dc
943 am edt Tue aug 20 2019

Synopsis
A stationary boundary will linger to our north today as an
upper level disturbance tracks overhead. A cold front will
approach the ohio valley Wednesday, sinking into our area
Wednesday night into Thursday. Behind the front, high pressure
will build over the region on Friday and dominate through the
weekend.

Near term through tonight
Another hot and humid day on tap across the area, but not
expecting the record heat that was observed Monday. 925 850mb
temperatures will run a couple degrees cooler today and model
consensus is in favor of highs remaining in the upper 80s to
middle 90s. With dewpoints stubbornly holding in the upper 60s
and low 70s, heat indices will again near or just exceed the
century mark, but remain just below advisory criteria.

The main story today will be another round of scattered strong
to locally severe thunderstorms this afternoon and evening.

Monitoring ongoing MCS and associated shortwave across central
west virginia this morning, and as it moves eastward, some
variation of this will likely serve as the trigger for
additional development this afternoon and evening. Couple this
with increasing instability as CAPE values will easily reach the
2-3k j kg range and steepening low- level lapse rates are
expected once again. Shear will continue to run on the weak side
at less than 20 knots, but there is a slightly stronger
steering flow today than prior days, albeit ~10 knots or so.

Still, storm motion will largely be driven by motion of remnant
mcs in addition to outflow and mesoscale boundary collisions.

Showers and storms are expected to initiate around or shortly
after noon, initially near what will be left of the MCS and the
terrain, then track eastward into the metro areas by this
evening. Some additional development is also possible along
outflow and sea- breeze boundaries. The strongest storms will be
capable of producing damaging wind gusts and large hail, and
this is supported by a marginal risk for severe storms by spc.

Also, given the persistent moist air mass in place and pwats
nearing 2 inches this afternoon, isolated incidents of flooding
is not out of the question in areas of heavy rain.

A downward trend in convection will occur this evening, with
partly cloudy skies and isolated showers lingering overnight. No
discernible change in the airmass yet, so temperatures will
remain on the mild side in the upper 60s to middle 70s.

Short term Wednesday through Thursday night
The primary shortwave axis tracks over the region on Wednesday
as a cold front nears the ohio valley, however plentiful cloud
cover will help inhibit our instability to a degree. Showers and
storms can be expected once again, but coverage and intensity
should be limited given said cloud cover and the tardy arrival
of the front late Wednesday night or early Thursday morning.

Highs Wednesday will be a touch cooler in the upper 80s to low
90s. Thursday, the front will be draped over the region, helping
spark scattered showers and thunderstorms during the afternoon
and evening hours. The front will continue its track southward
Thursday night, but how quickly it exits the area is still in
question. Will advertise a chance of showers and an isolated
thunderstorm Thursday night, but temperatures starting to
retreat into the 60s to near 70 degrees.

Long term Friday through Monday
The heat wave will break by Friday as a cold front slides
southeastward into the region. The ggem and ECMWF shows the
front stalled just to the south for the bulk of Friday, but
close enough to result in a continued chance of showers and
t-storms. The GFS is much more progressive, with the front
clearing far enough south to dry out the region. By Saturday,
the ggem and ECMWF has the front slip further south, with the
chance of precip decreasing from north to south, and by Sunday,
dry air from high pressure to the north prevails on the ecmwf.

The gfs, by comparison, has the front remaining well south with
dry, cooler canadian air dominating through the entire weekend.

By Monday, both the GFS and ECMWF allow easterly flow to start
bringing increased moisture back to the region despite the front
being south of the area and dry high pressure sitting to the
northeast, which could result in low clouds and drizzle. The
ggem, by comparison, generates a more significant low pressure
on the stalled front to the south, with an increased risk of
more significant rain. Regardless of the exact details, all
guidance depicts the dominance of cooler canadian high pressure
through the long term. This means that highs will be much
cooler, with high 70s to low 80s common.

Aviation 14z Tuesday through Saturday
Scattered showers and thunderstorms are expected today, with a
good chance of all terminals seeing brief episodes of subVFR
conditions between 18-00z. Some storms could be strong to
severe, with damaging winds and large hail being the primary
hazards. Patchy fog may result in MVFR ifr vis overnight.

Additional showers and storms can be expected both Wednesday and
Thursday afternoon evening as a frontal boundary moves into the
region. Again, brief episodes of subVFR conditions will be
possible in passing showers storms.

Risk of reduced CIGS and vis will continue Friday as a front
lingers nearby, but decreases Saturday as the front drops
further south.

Marine
Gusty showers and storms likely this afternoon and evening over
the waters, so if planning on being on the waters ensure you
have multiple ways to receive special marine warnings if they
are issued. A light southerly flow is expected today and
tonight, and will begin to increase Wednesday as a cold front
nears to the west. This will likely bring gusts to near sca
threshold late Wednesday afternoon and evening. The
aforementioned front will slowly makes it way south across the
waters late Wednesday night and during the day on Thursday, with
continued chances for gusty showers storms.

Winds may be near SCA levels Friday into Saturday as high
pressure slowly builds in from the north. Risk of thunderstorms
will be highest Friday, decreasing Saturday.

Lwx watches warnings advisories
Dc... None.

Md... None.

Va... None.

Wv... None.

Marine... None.

Synopsis... Bkf
near term... Mm bkf
short term... Bkf
long term... Rcm
aviation... Mm bkf rcm
marine... Mm bkf rcm


Weather Reporting Stations
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Stations Dist Age Wind Air TempWater Temp WavesPressureDewPt
WASD2 - 8594900 - Washington, DC 6 mi57 min SE 5.1 G 8 89°F 84°F1018.9 hPa
BSLM2 - Chesapeake Bay, MD 19 mi141 min N 1 82°F 1018 hPa76°F
NCDV2 33 mi57 min ESE 1.9 G 2.9 86°F 88°F1018.1 hPa
APAM2 - 8575512 - Annapolis, MD 34 mi57 min 86°F 1018.5 hPa
TPLM2 - Thomas Point, MD 34 mi51 min ENE 6 G 7 85°F 83°F1020 hPa (+0.7)71°F
44062 - Gooses Reef, MD 38 mi39 min NNE 3.9 G 3.9 84°F 1019.9 hPa
CPVM2 39 mi57 min 86°F 72°F
FSKM2 - 8574728 - Francis Scott Key Bridge, MD 41 mi57 min E 5.1 G 6 85°F 1019.3 hPa
FSNM2 41 mi57 min E 6 G 7 1019.2 hPa
BLTM2 - 8574680 - Baltimore, MD 42 mi57 min SE 6 G 11 86°F 84°F1018.7 hPa
COVM2 - 8577018 - Cove Point LNG Pier, MD 45 mi57 min NNW 5.1 G 7 82°F 1019.5 hPa
SLIM2 - 8577330 - Solomons Island, MD 46 mi57 min ESE 5.1 G 6 83°F 84°F1018.5 hPa

Wind History for Washington, DC
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Washington/Reagan National Airport, DC, VA5 mi59 minE 510.00 miMostly Cloudy91°F72°F54%1019 hPa
Fort Belvoir, VA7 mi1.9 hrsN 010.00 miFair87°F74°F68%1018.8 hPa
Camp Springs / Andrews Air Force Base, MD11 mi1.9 hrsENE 710.00 miFair86°F74°F69%1019 hPa
College Park Airport, MD15 mi68 minE 510.00 miFair88°F66°F49%1019 hPa
Washington/Dulles International Airport, DC, VA23 mi59 minENE 510.00 miA Few Clouds88°F72°F59%1019.1 hPa
Quantico Marine Corps Airfield - Turner Field, VA23 mi55 minE 410.00 miA Few Clouds88°F73°F63%1019.2 hPa
Manassas, Manassas Regional Airport/Harry P. Davis Field, VA24 mi55 minN 510.00 miFair88°F75°F66%1019.5 hPa

Link to 5 minute data for KDCA

Wind History from DCA (wind in knots)
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Last 24hrS7S6------S8S6S10S5CalmS5--------------N4N4N4NE5NE5E5
1 day agoS5S6S6SE9SE8S7SE9--S7S4S5NE8Calm----S5----S6S6S5--NW7--
2 days agoS5S6S7S7S5SE11----SW9SW5CalmS4S4S5S6SW4--S5S7S5S7----S5

Tide / Current Tables for Alexandria, Virginia
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Alexandria
Click for Map
Tue -- 06:14 AM EDT     0.62 feet Low Tide
Tue -- 06:26 AM EDT     Sunrise
Tue -- 10:59 AM EDT     Moonset
Tue -- 11:56 AM EDT     2.95 feet High Tide
Tue -- 06:15 PM EDT     0.40 feet Low Tide
Tue -- 07:56 PM EDT     Sunset
Tue -- 10:46 PM EDT     Moonrise
Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.

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32.82.31.71.20.80.60.711.72.42.832.82.31.71.10.60.40.50.81.42.32.9

Tide / Current Tables for Washington, Potomac River, D.C.
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Tide / Current data from XTide NOT FOR NAVIGATION
Sorry tide depth graphs only, please select another station.


Weather Map and Satellite Images
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wmap_A
GOES Local Image of Mid-Atlantic    EDIT
NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
Link to Loop



Other links: Northern Pacific     Contential US     Full GOES-East
Wind Forecast for Baltimore, MD/Washington (11,2,3,4)
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Ground Weather Radar Station Sterling, VA
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Disclaimer:
The information on this web site has not been checked for accuracy. It is for entertainment purposes only and should be independently verified before using for any other reason. There are five sources. 1) Documents and manuals from a variety of sources. These have not been checked for accuracy and in many cases have not even been read by anyone associated with L-36.com. I have no idea of they are useful or accurate, I leave that to the reader. 2) Articles others have written and submitted. If you have questions on these, please contact the author. 3) Articles that represent my personal opinions. These are intended to promote thought and for entertainment. These are not intended to be fact, they are my opinions. 4) Small programs that generate result presented on a web page. Like any computer program, these may and in some cases do have errors. Almost all of these also make simplifying assumptions so they are not totally accurate even if there are no errors. Please verify all results. 5) Weather information is from numerious of sources and is presented automatically. It is not checked for accuracy either by anyone at L-36.com or by the source which is typically the US Government. See the NOAA web site for their disclaimer. Finally, tide and current data on this site is from 2007 and 2008 data bases, which may contain even older data. Changes in harbors due to building or dredging change tides and currents and for that reason many of the locations presented are no longer supported by newer data bases. For example, there is very little tidal current data in newer data bases so current data is likely wrong to some extent. This data is NOT FOR NAVIGATION. See the XTide disclaimer for details. In addition, tide and current are influenced by storms, river flow, and other factors beyond the ability of any predictive program.